Brewer–Nash (BN) model: Also known as the “Chinese Wall” model, this security model prevents conflicts of interest by restricting access to sensitive information. It ensures that once a user accesses specific sensitive data, they are barred from accessing other related information that might lead to a conflict of interest. The model adapts based on the user’s data access history and is particularly useful in industries like finance or law, where controlling access to confidential information is critical.